[boi-ster-uhs, -struhs]
rough and noisy; noisily jolly or rowdy; clamorous; unrestrained: the sound of boisterous laughter.
(of waves, weather, wind, etc.) rough and stormy.
Obsolete. rough and massive.

1425–75; late Middle English boistrous, variant of Middle English boistous crude, strong, fierce, gross; of obscure origin

boisterously, adverb
boisterousness, noun
unboisterous, adjective
unboisterously, adverb
unboisterousness, noun

1. uproarious, obstreperous, roistering, loud, vociferous, impetuous. 1, 2. tempestuous, tumultuous, turbulent, violent, wild.

1, 2. calm, serene. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
boisterous (ˈbɔɪstərəs, -strəs)
1.  noisy and lively; unrestrained or unruly
2.  (of the wind, sea, etc) turbulent or stormy
[C13 boistuous, of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 15c., unexplained alteration of M.E. boistous (c.1300) "rough, coarse (as of food), clumsy, violent," of unknown origin, perhaps from Anglo-Fr. bustous "rough (road)," which is perhaps from O.Fr. boisteos "curved, lame; uneven, rough" (Mod.Fr. boiteux), itself of obscure origin. Another guess traces
it via Celtic to L. bestia. Used of persons from 1560s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The berry pickers, youths and maidens, laughed and shouted boisterously.
They usually announce their presence loudly, boisterously, with gusto.
Boisterously funny yet intensely serious, the work mixes story telling, music and dance as it delves into social issues.
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